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1.5=y/2.1
We move all terms to the left:
1.5-(y/2.1)=0
We add all the numbers together, and all the variables
-(+y/2.1)+1.5=0
We get rid of parentheses
-y/2.1+1.5=0
We multiply all the terms by the denominator
-y+(1.5)*2.1=0
We add all the numbers together, and all the variables
-1y+3.15=0
We move all terms containing y to the left, all other terms to the right
-y=-3.15
y=-3.15/-1
y=3+0.15/1
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